256931163 has 16 divisors (see below), whose sum is σ = 384919200. Its totient is φ = 169361280.

The previous prime is 256931161. The next prime is 256931177. The reversal of 256931163 is 361139652.

256931163 is a `hidden beast` number, since 2 + 569 + 31 + 1 + 63 = 666.

It is not a de Polignac number, because 256931163 - 2¹ = 256931161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256931161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51058 + ... + 55863.

It is an arithmetic number, because the mean of its divisors is an integer number (24057450).

Almost surely, 2^256931163 is an apocalyptic number.

256931163 is a deficient number, since it is larger than the sum of its proper divisors (127988037).

256931163 is a wasteful number, since it uses less digits than its factorization.

256931163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107019 (or 107013 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 256931163 is about 16029.0724310548. The cubic root of 256931163 is about 635.7293481717.

The spelling of 256931163 in words is "two hundred fifty-six million, nine hundred thirty-one thousand, one hundred sixty-three".